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    <script>
        // 1、Object.is 判断两个值是否完全相等
        // console.log(Object.is(100, 100)); //true
        // console.log(Object.is(NaN, NaN)); //true
        // console.log(NaN === NaN); //false

        // 2、Object.assign 对象的合并
        const config1 = {
            host: 'localhost',
            port: 3306,
            name: 'root',
            pass: 'root',
            test: 'test'
        };
        const config2 = {
            host: 'http://www.baidu.com',
            port: 33060,
            name: '百度',
            pass: 'iloveyou'
        }
        console.log(Object.assign(config1, config2)); //第二个对象里面的属性将会替代第一个函数里面的属性，若第一个对象里的属性第二个对象没有，则会加到第二个对象里面
        // 3、Object.setPrototypeOf 设置原型对象 Object.getPrototypeOf
        const school = {
            name: '龙哥'
        }
        const cities = {
            xiaoqu: ['北京', '上海', '深圳']
        }
        Object.setPrototypeOf(school, cities);
        console.log(Object.getPrototypeOf(school));
        console.log(school);
    </script>
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